ethtool: bump to 5.1

ethtool: bump to 5.1

 * Feature: Add support for 200Gbps (50Gbps per lane) link mode
 * Feature: simplify handling of PHY tunable downshift
 * Feature: add support for PHY tunable Fast Link Down
 * Feature: add PHY Fast Link Down tunable to man page
 * Feature: Add a 'start N' option when specifying the Rx flow hash indirection table.
 * Feature: Add bash-completion script
 * Feature: add 10000baseR_FEC link mode name
 * Fix: qsfp: fix special value comparison
 * Feature: move option parsing related code into function
 * Feature: move cmdline_coalesce out of do_scoalesce
 * Feature: introduce new ioctl for per-queue settings
 * Feature: support per-queue sub command --show-coalesce
 * Feature: support per-queue sub command --coalesce
 * Fix: fix up dump_coalesce output to match actual option names
 * Feature: fec: add pretty dump

Signed-off-by: Petr Štetiar <ynezz@true.cz>